<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">

        class App extends React.Component {
            state = {
                count: 0,
                content: '类式组件',
                isHot:true
              
            }

            render() {
                console.log("----render----");
                const { count,isHot } = this.state;
                return (
                    <div>
                        <button onClick={this.handle} >+</button>
                        <p>{count}</p>
                        <button onClick={this.changeWeather} >+</button>
                        <p>{isHot?"好热好热":"太冷了"}</p>
                      
                        
                    </div>
                )
            }

            //事件函数
            handle = () => {
                //直接修改state不会重新调用render 不会重新渲染
                let {count}=this.state
                this.setState({
                    count: ++count
                })

            }

           changeWeather = () => {
                //直接修改state不会重新调用render 不会重新渲染
                let {isHot}=this.state
                this.setState({
                   isHot:!isHot
                   
                })
                console.log(this.setState);
            }
        }

        const root = ReactDOM.createRoot(document.getElementById('app'));
        root.render(<App />)




    </script>
</body>

</html>